Examine source code of Tally: LeetCode to GitHub Sync

{
  "manifest_version" : 2 ,
  "name" : "Tally: LeetCode to GitHub Sync",
  "version" : "1.0.0",
  "description" : "Automatically sync accepted LeetCode solutions to GitHub, with a self-updating progress README. Open source, no server.",
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "96" : "icons/icon-96.png",
    "128" : "icons/icon-128.png"
  },
  "permissions" : [
    "storage" ,
    "notifications" ,
    "https://leetcode.com/*" ,
    "https://api.github.com/*" ,
    "https://github.com/login/*" 
  ],
  "background" : {
    "scripts" : [
      "github.js" ,
      "background.js" 
    ],
    "persistent" : true 
  },
  "content_scripts" : [
    {
      "matches" : [
        "https://leetcode.com/problems/*" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_start" 
    }
  ],
  "web_accessible_resources" : [
    "inject.js"
  ],
  "browser_action" : {
    "default_title" : "Tally",
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "32" : "icons/icon-32.png",
      "48" : "icons/icon-48.png"
    }
  },
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tally-leetcode@brandenxo.github.io",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteContent"
        ]
      }
    }
  }
}